Acanthocardia echinata (Linnaeus, 1758)
Cardioidea : Cardiidae
To size: To 75mm. Shell Structure: Robust. Equivalve: Equivalve. Equilateral: Slightly inequilateral, beaks just infront of midline. Tumidity: Inflated. Outline: Broadly oval posterior margin becoming almost straight in larger shells. Contour: Umbonate, posterior angle weak.
Sculpture: 18-22 strong radial ribs, each carrying a row of narrow spines arising from the midline of the rib. In early stages, the triangular shaped spines are joined to each other giving a serrated profile but with growth the spines often appear separated. On the anterior and middle area the spines are more conical with the upper faces excavated and the tips bending to the posterior; on the posterior the spines remain triangular. Overall with a distinct concentric rugose sculpture most prominent in interspaces. Margin: Deeply crenulated, interlocking ends of ribs and interspaces. Ligament: External, a prominent raised band set on a prominent nymph. Hinge: RV with 2 cardinals the posterior slightly the larger; 2 anterior and 1 posterior laterals: LV with 2 cardinals and single anterior and posterior laterals. Pallial Musculature: Pallial line entire. Periostracum: Thin. Colour: White, straw and brown often in alternating broad concentric bands.
Distribution & Ecology
Continental Shelf (to 200m)
Additional Information & Related Species
Cardioidea : Cardiidae
Listed are literature citing Acanthocardia echinata (Linnaeus, 1758). Reference containing the species Type Description is highlighted.
Linnaeus C 1758. Systema Naturae. Editio decima. 1. Regnum Animale Holmiae, Laurentii Salvii. 824pp.
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